thumb|Zak in 2021 Anna Kuzenkova (, ; born ), known professionally as Anna Zak (), is a Russian-Israeli singer, model, actress, and online personality. Her following consists of 5 million followers on
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5b9d671a87c5e7402f5b70e6858ae38df159c46bd25467072ac33a759aeb64. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a2a2b25-2016-4ffc-a82e-7dc2efcd7bcd.json and https://artists.proofprofile.net/proofs/artist/4a2a2b25-2016-4ffc-a82e-7dc2efcd7bcd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05364e674e7603c5125536bcd8490076babd759d9cb45e4f69e3904410f41151. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCADE1799800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3dbfb2a409467cb32dea299eebe734ff6181a790b102cecc2bedbd6bd793b3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCADK1755599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b8f76416d466ffdde2344dd774676e6a92e712cb76c3004389648ed0de0559. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41801935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c0ef2522ae7a28698790df7be5f8ab7838c4b1e12545898107adef4fe4420a. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1011901528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e4545de6d51c2052d333a46ae2d8d56e180d321e296ad755d25f8f054b3ee8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012000544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6430096131f70f55c43c0b1d30d765ad61f785b385969cb236c499f9089540e0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa370cde976c68678d8d7679d2e3dcdd4cea16551e7f897768cb28c28da6268fb. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50ec0437a057c19d13dad3907ca38603f021b160537a6b228df48c3e3a3058d. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2b29d02a51cd429f55f43f1c1624b12fd4d106ba3d5a73b1c6cf599d4137ea. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL4432100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371cb4b92ed5fc4645b53376be5434d6ff01b7656c0b73b19a443002565ce533. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc508c7609453dbb499f52c63a00dac913d4bc1ce83bb4528a6c6a3c26b345071. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d1426d2293015fdcd3e4d6cf2d91efd0cb3394acc13541fd7400f708fad899. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46b026389a414e3fa904c79f7b4b22cac82378dd4c86383a1d9696e9197669c. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:46:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012500742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88cd2a47897b30d6fc50e0bdc7b0f2566f7bdc8b616301acb5500403978b2d7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012300609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208646c3a9cc611fe84d8925fedd48804265619976326d28f00c3a5eac9c480b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012301041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ae71cbe627180ade9a3b3b611786323f50b7490ce904dc6b0466e461a74886. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012301055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0051d77b42eafb7bfd7d39d95e19cca2df1fa6fa7de5b4b098873c2101c4ca. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012301077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f20c808dfeb3ac046a57651f4ba88aae6bc4ca903a6aeda7b9b04badd1387a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012302379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2c39cc05ca247faa5a36f0ff5924ec46a3a7cbddbf4354c436fbc969dfd488. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012401906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1575632c4724f2e111ae3895086b28d9ca0329c115235605f4f44da3877c67ce. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:49:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012501158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9748a51c2ccf67b23307eb385e39fcbdcc9acd6cb6533520ff02615d1c0ecce5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX282065634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10374d7a3b1877a51ef3d7f3c7b5705480cc7b9df02ff6c17b291291f8685801. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012400809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f948f951c9362b3db1be9d013a45196d7071d73786ed66d37ab9bd072820e8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012401002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10374d7a3b1877a51ef3d7f3c7b5705480cc7b9df02ff6c17b291291f8685801. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012400809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526cf5189533184b60271bbc8b0463e957acc97fdc05f5c71dd53fcf793cde33. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dacc082e6cda444dd03f76a40b3dce3b058c69397421bbbad06960971ba2e0. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cb9a35828be122d639a1b856402d8adadb09859b3f284e1447f53d184a57bd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL7192500076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526cf5189533184b60271bbc8b0463e957acc97fdc05f5c71dd53fcf793cde33. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1a9004580da47251fa6a235be45d3b4ffd5fc23df81c3bd3357480ee71b5b0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012100384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af70c69a02219654dc57aa2548d2934354682d3ccc91db0ef5ee0c9e3814c0d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012000839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd663148c0310a180012df36ba3799693de98154760a714cedde37f455b44f3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1012301994.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch